```

feat(ai_agent): 完善AI适配器和服务功能

- 添加OpenClaw和Hermes健康检查接口
- 实现OpenClaw工具调用功能
- 重构AI适配器使用常量定义
- 增加AI技能系统支持
- 更新配置文件中的默认模型提供者设置

refactor(scheduler): 使用常量替换硬编码值

- 将硬编码的actor值替换为ActorValue常量
- 将receive_id_type替换为FeishuReceiveIdType枚举

refactor(audit): 统一审计日志常量使用

- 将硬编码的actor、source、risk_level等值替换为对应常量
- 更新审核服务中的状态和操作常量引用

refactor(approvals): 标准化审批模块常量使用

- 将applicant默认值替换为ActorValue.API常量
- 使用ApprovalStatus常量替代硬编码状态值
- 更新审核操作常量引用
```

app/modules/audit/constants.py

@@ -0,0 +1,39 @@
+from enum import StrEnum
+
+
+class AuditAction(StrEnum):
+    AI_ASK = "ai.ask"
+    AI_PROVIDER_HEALTH = "ai.provider_health"
+    OPENCLAW_TOOLS_INVOKE = "openclaw.tools.invoke"
+    GENERATE_EVENTS = "generate_events"
+    FEISHU_SEND_TEXT = "send_text"
+    FEISHU_SEND_CARD = "send_card"
+    APPROVAL_CREATE = "approval.create"
+    APPROVAL_APPROVE = "approval.approve"
+    APPROVAL_REJECT = "approval.reject"
+    LEGACY_SYNC_PROJECTS = "sync_projects"
+
+
+class AuditRiskLevel(StrEnum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+
+
+class AuditSource(StrEnum):
+    API = "api"
+    OPENCLAW = "openclaw"
+    RISK = "risk"
+    FEISHU = "feishu"
+    APPROVAL = "approval"
+    LEGACY_MYSQL = "legacy_mysql"
+
+
+class AuditTargetType(StrEnum):
+    AI = "ai"
+    OPENCLAW_TOOL = "openclaw_tool"
+    RISK_EVENTS = "risk-events"
+
+
+class AuditStatus(StrEnum):
+    SUCCESS = "success"

app/modules/audit/models.py

@@ -3,20 +3,22 @@ from datetime import datetime
 from sqlalchemy import DateTime, Integer, String, Text
 from sqlalchemy.orm import Mapped, mapped_column
 
+from app.core.constants import ActorValue
 from app.core.database import Base
+from app.modules.audit.constants import AuditRiskLevel, AuditSource, AuditStatus
 
 
 class AuditLog(Base):
     __tablename__ = "audit_logs"
 
     id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
-    actor: Mapped[str] = mapped_column(String(128), default="system", index=True)
-    source: Mapped[str] = mapped_column(String(64), default="api", index=True)
+    actor: Mapped[str] = mapped_column(String(128), default=ActorValue.SYSTEM, index=True)
+    source: Mapped[str] = mapped_column(String(64), default=AuditSource.API, index=True)
     action: Mapped[str] = mapped_column(String(128), index=True)
     target_type: Mapped[str | None] = mapped_column(String(128), nullable=True)
     target_id: Mapped[str | None] = mapped_column(String(128), nullable=True)
-    risk_level: Mapped[str] = mapped_column(String(32), default="low", index=True)
+    risk_level: Mapped[str] = mapped_column(String(32), default=AuditRiskLevel.LOW, index=True)
     request_payload: Mapped[str | None] = mapped_column(Text, nullable=True)
     response_payload: Mapped[str | None] = mapped_column(Text, nullable=True)
-    status: Mapped[str] = mapped_column(String(32), default="success", index=True)
+    status: Mapped[str] = mapped_column(String(32), default=AuditStatus.SUCCESS, index=True)
     created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, index=True)

app/modules/audit/schemas.py

@@ -3,17 +3,20 @@ from typing import Any
 
 from pydantic import BaseModel, ConfigDict
 
+from app.core.constants import ActorValue
+from app.modules.audit.constants import AuditRiskLevel, AuditSource, AuditStatus
+
 
 class AuditLogCreate(BaseModel):
-    actor: str = "system"
-    source: str = "api"
+    actor: str = ActorValue.SYSTEM
+    source: str = AuditSource.API
     action: str
     target_type: str | None = None
     target_id: str | None = None
-    risk_level: str = "low"
+    risk_level: str = AuditRiskLevel.LOW
     request_payload: Any | None = None
     response_payload: Any | None = None
-    status: str = "success"
+    status: str = AuditStatus.SUCCESS
 
 
 class AuditLogRead(BaseModel):